Figure 5.

Photodegradation of MO solutions over CNTs (a), TiO2 (b) and TiO2 NPs-coated CNTs synthesized with CNTs/TiO2 molar ratio of 1/4 (c), 1/2 (d), 1/1 (e), 2/1 (f) and 4/1 (g). C0 and C is the initial concentration of MO before irradiation and after irradiation for a period of time, respectively

Xie et al. Nanoscale Research Letters 2009 5:603-607   doi:10.1007/s11671-009-9513-5